Oral absorption of iron is notoriously unreliable,
best get someone to crucify you with rusty nails. That should do it.
(The Porcupine From Purgatory we of all lost both have them, Sun 23 Jun 2024, 18:18, archived)

Supposedly if you cook with iron pans you ingest some that way
though I've not researched this claim.
( brb Monkhouse Stampede, Sun 23 Jun 2024, 21:40, archived)